Re: Tide article

[Robert Cohen <Robert.Cohen@PO-BOX.ESU.EDU>]

At 12:10 10/22/01 -0400, Chuck Britton wrote:
> It sounds to me like someone's students need to be turned loose with
> a FFT program and LOTS of this gathered experimental data!

I thought "someone's students" already have.  See below.

On Sunday, October 21, 2001 7:15 PM, Jim Green wrote:

> John, I will not "debate" you re this -- I have stated my understanding
> from study and research -- well my student's research -- down the road
from
> John Denker.
> [snip]
> Both our results and NOAA's calculations showed no
> correlation  of high
> water  or Spring Tide to anything: Moon or Sun position, Moon or Sun
> period, etc etc.  for any location (except for amphidromic points)

I quickly downloaded a year's worth of hourly data from that NOAA site
and performed a SFT (slow fourier transform - I wrote it myself) and found
a very significant peak at 12.42 h and smaller ones (but very clear) at
12.00, 12.66 and 23.93 h.  It wasn't until I did the SFT that I compared
the results to the list below.

>       M2......12.42hr..Principal Lunar --  The period used by
> the NewZeland
> site
>       S2.......12.00.....Principal Solar..........
>       N2.......12.66.....Lunar Elliptic...........
>       K2........11.97....Luni-Solar Semi-Diurnal..
>       K1........23.93....Luni-Solar Diurnal.......
>       O1........25.82....Principal Lunar Diurnal -- I assume
> = John's Mean
> Lunar Day
>       P1.........24.07....Principal Solar Diurnal..

Was I *not* supposed to get these peaks?

--------------------------------------------
Robert Cohen           rcohen@po-box.esu.edu
570-422-3428         http://www.esu.edu/~bbq
Department of Physics
East Stroudsburg University
East Stroudsburg, PA  18301
--------------------------------------------